Electrolytic manufacture of colloidal metals



PatentedApr. 22, 1924,,

warren STATES PATENT OFFICE.-

CARL HERMAN)! vou HOESSLE, or RADEBEUL, NEAR DRESDEN", REPUBLIC or saxolw,

GERMANY.

ELECTROLYTIC MANUFACTURE OF VC'OLLOIDAL mnriuis.

loin-swing.

HOESSLE, a subject of the Republic of Sax-' ony, German Republic, and resident of 3 "Sedanstrasse,-Radebeul, near Dresden, Re-

public of Saxony, German Republic, have invented new and useful Improvement in the Electrolytic Manufacture of Colloidal Metals (for which I filed application in Ger- 10 many, Feb. 16, 1919), of which the follow- Y sides a necessary addition of a protective col-' ingis a specification.

The hydrosols of these metals which are readily oxidized when finely distributed'in water, could not be prepared hitherto, for

the reason that said metals, especially iron,

nickel, lead, tin,'aluminium, cannot be obv tained by reducing their-compounds in an aqueous solution. They are also oxidized atany attempt of atomizing-them electrically under water.

A number of methods are known for preparing colloidal solutions ofmetals, but as most metals are more or less easily oxidized when finely distributed, the colloidal solutions prepared in this way generally contain metallic oxide. Bredig, .Svedberg and 0thers have described methods of electrically preparing colloidal solutions of metals, which may be called electrical atomizing.

80 They formed an electric are under water be-' tween metallic wire points and observed that the metal is disintegrated and remains suspended in the water in an extremely fine state of division. The solutions of. most 86 metals obtained in this manner are'not stable but are partly oxidized.

Rebiere stated (Ghemiker Zeitung 1912, page 1003 that even colloidal silver prepared in this way contains more or less ox- 4 ide of silver. Ehrenhaft- .(Anzeiger der Wiener Aka'demie 39, page 241 to 243) disintegrated -nickel, cobalt, aluminium, iron and bismuth by forming an electric are between wires of these metals. But the col- .oured hydrosols obtained by this way are not metals as erroneously supposed, but col-' loidal oxides of metals.

According to the present invention the hydrosols of the metals named above, as

- on silver, copper, iron, chromium, nickel, lead",

. brenzcatechin,

readily oxidized;

Application filed August 31,1921. Serial n. 497,455.

mercury, aluminium,- tin, bismuth-cobalt, 9

uranium, tungsten, titan, molybdenum,jthallium, vanadium, tantalum, mate obtained in a pure state. -I have found that the formation ofoxide'is avoided by adding to the water, inwhich a small quantityofareducing agent, for instance hydrosulphitelflofisoda,

pyrogallol, hydroxylamin, hydrazin or the like, has been dissolved ,=be-

loid, as gum arabic, albumose or, the like. If the metals are electrically atomized by forming an electric are between wires of them under suchsolutions to which a reducing' agent is added, colloidal metals are obtained in a pure state. Sometimes the reducing agent hasat the same timega protective power on colloidal substances.- The solutions of the colloidal metal obtained in' this manner can be purified. For this pun pose the reducing agent'isremoved by dialyzing the solution or by precipitating the colloidal metal, washing and dissolving it again. Of course, the admission or influence of air must be carefully avoided, ..for the pure hydrosols of metals generally are The new hydrosols are of,, great medical value but may also beemployed for various I technical purposes.

' ,E'marrtple I.

In a solution of 0.75 parts ofsodium hydrosulphite and 1 part of gum ara'bic in 1000 parts of water copper is atomized by an electric current of 8 amp. and 20volts. 'On dialyzing the solution, admission of air should well be excluded and a dark-red hy--- drosol ct copper is obtained. 1

I Ewample H.-

In a solution of 0.75 parts of brenzacatechin and Lpart ofalbumen', albumose or other' substances of highmolecularweight in 1000 parts of water an electric'arc is formed 95 between wires of iron. {Colloidaliron 'is formed, which is precipitated from the darkred solution, by the'i addition of a. small quantity of an acid. The precipitate is washed. water, air being well excluded,

and dissolved again in purewater by adding alkali.

'E'aample 111.?

of nickel are electrically atomized" in a'solution of '1 part of albumose and 0.7

parts of sodium hydrosulphite in 1000 parts i obtained; (The colloidal aluminium known'hitherto was only colloidal aluminium hydroxide.)

' 'E'wamgale V.

-.Pieces of tungsten are atomized under wa: ter, while adding an albumen derivative and J. a reducing agent. A' deep coloured. hydrosol amples and the quantities given therein.

is obtained. w v 'The invention isnotconfined to these ex,-

What I claim is; loidal metals iwhichconsists in" disintegrating the metals inwate'r whil'e adding' a re-v ducing agent.

- 2. A process for the manufacture of .col-- loidal metals which-consists in disintegrating the ,m'etals'in water, while adding-a reagent anda protective colloid. processfor the manufacture of colloidaLmetals which consistsinydisintegratv dncingagent and a'protective colloid, and" dlaly'zingthe solution.'

the metals in water, while adding a reducing agent, and dialyzing the solution.

ing the metals iii-water, while adding a re- 5. A process'for the manufacture of colloidal metals which consists in 'disintegrab. ing the metals in water, while-adding a.

reducing agent, and precipitating the c01 loidal metal. I

' .6. A process for cin'g agent and a protective colloid, and

precipitating the colloidal metal. I

7. A process. for hemanufactu special-care being taken to prevent admission of air.

8. A process for the manufacture of colcing, agent and a protective colloid, precipitating the colloidal metal and dissol-v- 1 loidal metals oxidable when finel loidal metals oxidable when finel precipitating the colloidal 'metals.

processfor the manufacture of col-. loidal metals, whichconsists in disintegratithe manufacture of; colloidal metals which consists in disintegrat re of 001-" loidal metals'which consists in .disintegrating the metals in water, while. adding a reducing agent, precipitating the colloidal metal-and dissolvingit again in, water, v

"loidal metals oxidable when finel loidal metals oxidable whentfinely distributed-in water, which consists in electrically atomizing them in water, while adding a reducing agent.

10. A process for the manufacture of coldistributed in water, which consists in e ectrically atomizing them in water,while adding a reducing agent and a rotective colloid.

11.- A' process for t e manufactureof colloidalmetals oxidable when. finel distributed in water, which consists in'e ectrically atomizing them in water while adding a reducing agent, and dialyzing the solution.

- 12.- A process for the manufacture of colloidal metals oxidable when finely-distributed'in water, Whichconsists in electrically 'atomizing them'in water to which a reducin a cut and a protective colloid is added, an dialy'zing the solution.

,13. A process for the manufacture of coldistributed in water, which consists in e ectrically 1.- A process for the manufacture .of'colatomizing themin water to whicha'reducing' metals. U I

.14. A process for. the m'anufactureof golloidal metals oxidable when, finely 'disti'ib-.

agent. is added, and precipitatingthe colloid ducing agent and a protective colloid, and s 15.. A process for the manufacture of col- 7 loidal -metals oxidable when finel distrib- ..uted in water, which consists in- ,e ectripally atomizing them in water while-adding a reducing agent, precipitating the colloidal metals, special care. beingtaken to prevent admission of-air. I

16. A process for the manufacture of colloidal metals oxidable when finel atomizing them in water while adding a reducing agent and protective colloid, precipita'ting the colloidal metals, special care being taken to prevent admission of air. 7

17. A process .:for the manufacture of colloidal metals oxidable when finel atomizing them in water, while addin a reducing agent,.' precipitatng theco oidal metals and dissolvin them agaiif'inmwater,

distributed in water, whichconsi'stsin e ectrically distributed .in water,.which consists in e ectrically special carebeing ta on to prevent admissio'n of air.

,18.'A-process for the manufacture of 001- Y utedin water, which consists in e ectrically atomizing them in water, while addinga reducing a ent and protective colloid, precipitating t e colloidalimetals and dissolvthem again in water, special care being ta en to prevent admission of air.

distrib- 19. As new articles of manufacture colloidal metals oxidable when finely distributed in water containing a reducing agent which prevents oxidation, which are readily oxidable by the influence of air, soluble in water, forming darkly coloured solutions.

20. As new articles of manufacture colloidal metals oxidable when finally distributed in water containing a reducing agent which prevents oxidation and a protective colloid, which are obtained by electrically atomizing these metals in water while adding the reducing agent.

21. As new articles of manufacture the aqueoussolutions of colloidal metals oxidable when finely distributed in water containing a reducing agent which prevents oxidation, which are obtained by electrically 22. As new articles of manufacture the aqueous solutions of colloidal metals oxidable when finely distributed in water containing a reducing agent which prevents oxidation and a protective colloid, which are obtained by electrically atomizing these metals in water while adding the reducing agent, and dialyzing the solution.

' In testimony, that I claim the foregoing as my invention, I have signed my name in presence of two witnesses, this eighth day of August, 1921. Y

CARL HERMANN VON HOESSLE. Witnesses:

WILHELM Mnvns, ALEXANDER FIsoHnR. 

